Question 666118
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Hi,
Re TY, Yes, you certainly had the right idea!
{{{4x/(3x^2 + x)}}}
Yes. Consider when the denominator is zero
  3x^2 + x = 0
 x(3x+ 1) = 0   
 x = 0
Or (3x+ 1) = 0  
 x = 0  Or  x = -1/3  makes the denominator zero and make 4x/3x^2+x undefined